Are you safe with your temporary protective grounds? (Case study)

This case study is based on an arc flash incident that occurred at a pellet plant facility located in Port-Cartier, Québec, Canada. The incident occurred while replacing a 2000A 600V MCC main molded breaker by a more recent model, as recommended by our technical service. One of the causes of this arc flash incident was the temporary protective ground that didn't withstand the short circuit current when the power accidentally got back to the workspace. The worker suffered 1
^st
degree burns to his face and hand. A full investigation was done. The investigation revealed a couple of facts, but the one we'll focus on in this case study is that the temporary protective GND wasn't big enough to withstand the short circuit current available at that point. All the proper procedures had been followed. That incident lead to a modification in our procedures and was communicated to other electrical workers.